Polyster Flim Capacitor is a type of capacitor that uses a thin polyester film as the dielectric material. They are commonly used in electronic circuits where high stability, low cost, and high capacitance values are required. These are made by depositing a thin layer of metal on both sides of the polyester film, which forms the electrodes. Polyster Flim Capacitor is highly stable and have a low dissipation factor, which means they don't generate much heat or lose much energy as heat. This makes them ideal for use in circuits that require high precision and stability, such as audio circuits, filters, and oscillators.